The FSA has issued the following advice: “If you have bought the above product and have an allergy or intolerance to milk or milk constituents, do not eat it.

“Instead please call PepsiCo’s consumer care line on 0800 274777 for a full refund.”

A spokesperson for Pepsico told the Sun Online: “Whilst the packaging does state that the chips are made in a factory which handles milk, the allergen is not declared on the ingredients list and therefore presents an allergen risk for milk.

“We take the safety and quality of our products very seriously and we are reaching out to consumers through retailers, the FSA, allergen support group networks and our own database of those affected by allergies.”

They write on their website: If you have bought the above product and have an allergy or intolerance to milk or milk constituents, do not eat it. Instead please call Pepsico’s consumer care line on 0800 274777 for a full refund. No other PepsiCo products are known to be affected.